style(coding): Add dev dependency to phpcs

Author: julienloizelet

composer.json

@@ -41,6 +41,7 @@
         "symfony/var-dumper": "^5.2",
         "phpunit/phpunit": "8.5.21",
         "clean/phpdoc-md": "^0.19.1",
-        "phpmd/phpmd": "@stable"
+        "phpmd/phpmd": "@stable",
+        "squizlabs/php_codesniffer": "^3.6.2"
     }
 }

docs/ddev.md

@@ -221,7 +221,7 @@ LAPI will advise you to ban this IP as it's within the 1.2.3.4/30 range.
 
 ### Coding standards
 
-#### PHPCS
+#### PHPCS Fixer
 
 We are using the [PHP Coding Standards Fixer](https://cs.symfony.com/)
 
@@ -239,9 +239,23 @@ ddev phpcsfixer my-own-modules/crowdsec-php-lib tools/php-cs-fixer
 
 #### PHP Mess Detector
 
-To use the `phpmd` tool, you can run:
+To use the [PHPMD](https://github.com/phpmd/phpmd) tool, you can run:
 
 ```
 ddev phpmd ./my-own-modules/crowdsec-php-lib tools/phpmd/rulesets.xml src
 
+```
+
+#### PHPCS and PHPCBF
+
+To use [PHP Code Sniffer](https://github.com/squizlabs/PHP_CodeSniffer) tools, you can run:
+
+```
+ddev phpcs ./my-own-modules/crowdsec-php-lib/vendor/bin/phpcs my-own-modules/crowdsec-php-lib/src
+```
+
+and:
+
+```
+ddev phpcbf ./my-own-modules/crowdsec-php-lib/vendor/bin/phpcs my-own-modules/crowdsec-php-lib/src
 ```